I guess the idea is to minimize the amount of slurry per square meter. "Nitrate exceeds the limit value of 25 mg/l in groundwater at almost 15 % of the monitor

I guess the idea is to minimize the amount of slurry per square meter. "Nitrate exceeds the limit value of 25 mg/l in groundwater at almost 15 % of the monitoring sites across Switzerland. In areas where arable farming is predominant, concentrations are above the limit at more than 40% of the monitoring sites."